compound joint

例句：

1. 1. The surgeon used a compound joint to replace the damaged bone.
   外科医生使用一个复合关节来替换受损的骨头。
2. 2.The patient was in a lot of pain after the surgery, but the compound joint helped alleviate it.
   患者在手术后非常疼痛，但是复合关节帮助缓解了疼痛。
3. 3.The researcher discovered a new compound joint that could be used for prosthetic limbs.
   研究者发现了一种新的复合关节，可用于假肢。